Wedeler Au

Wedeler Au
Course and catchment area; in red the Hamburg border
Data
location	Hamburg , Schleswig-Holstein
River system	Elbe
source	Hamburg-Sülldorf 53 ° 35 ′ 12 ″  N , 9 ° 48 ′ 56 ″  E
Source height	21  m above sea level NN
muzzle	West Wedel to the Elbe Coordinates: 53 ° 34 ′ 34 "  N , 9 ° 40 ′ 16"  E 53 ° 34 ′ 34 "  N , 9 ° 40 ′ 16"  E
Mouth height	1  m above sea level NN
Height difference	20 m
Bottom slope	1.6 ‰
length	12.6 km
Catchment area	55.85 km²
Right tributaries	Rüdigerau , Hetlinger Inner Elbe
Communities	Hamburg , Wedel
Wedeler mill pond and meadows from the west; in front the Schulauer Strasse

The Wedeler Au is a stream in northern Germany of 12.6 km in length, 6 km of which are in Hamburg and 6.6 km in Schleswig-Holstein . This makes it the longest tributary of the Elbe in Hamburg because the sources of the longer flowing waters of the Bille , Alster and Este are all in Schleswig-Holstein and Lower Saxony .

Its source is in Sülldorf , a district in the Hamburg district of Altona , right on the border with Schenefeld and Iserbrook ; west of the built-up urban area of Wedel , the Wedeler Au flows into the Elbe . The area is classified as " Ecoregion 14 (Central Plain)". The type of flowing water is a sand-shaped lowland stream (type 14).

Around 1960 the stream was one of the most polluted bodies of water in the Federal Republic; In the mid-1980s, measures began to restore it. In the 21st century, the Wedeler Au was developed into the main body of water in a regional park of around 5,130 hectares, which is considered a pilot project for cross-border cooperation in the Hamburg metropolitan region .

Meaning in the past

The Wedeler Au on a map of Stormarn ( Johannes Mejer , 1650)

The Wedeler Au never played a role as a traffic route due to its shortness and small dimensions, but also because of its alignment parallel to the Elbe, apart from the protected Auhafen near the mouth. A ford , which was part of the ox path between Jutland and the Lower Elbe, led through the valley on the lower reaches of the valley probably since the Bronze Age ; near this point is the origin of the city of Wedel. In Johannes Mejer's "Landt Carte von der Grafschaft Pinnenberg " from 1650 the Au is still called Wedelbeck and shows a striking difference to the current course: at that time it originated far northeast of Schenefeld. It was not until much later that this section was partly drained and partly diverted into the northward flowing Düpenau .

At the weir of the mill pond, in the former Feldmark von Schulau - today the eastern part of Wedels - a water mill was built in the 16th century. It is conceivable that farmers from Sülldorf or Rissen used the Wedeler Au in the early modern period to bring grain to the local grain mill, but it is not proven. This is countered by the fact that there were only a handful of rather poor farms in these two villages, the fields of which were far away from the stream (roughly along the current B 431 ), while the boggy lowland lying between them (called "Brook" in Low German) was only used as pasture land and for the extraction of tan from the bark of oaks and reeds and was only cultivated in the 19th century. It would be all the more unlikely that there would be a second mill in this area, as it was sometimes derived from the old field name “Woistmöhlen” on the Rissen banks of the Wedeler Au . Every year the men from the villages moved into the wetland together to cut the reeds (here called "Katt'nküll" or "Bullnpesel"); when dried, it was used as straw and additional feed .

Until about 1800 the area reaching north to the middle reaches of the Au was also unforested. It was only after the Holstein land reform of 1793 that the reforestation of the moorland and heathland began to form today's Klövensteen forest . Until 1937 this brook lay entirely on Holstein territory; The city of Altona and thus the upper 6 km of the Wedeler Au were only incorporated into the state of Hamburg through the Greater Hamburg Act , and one year later into the city of Hamburg.

Today's course and accompanying routes

Upper course in the Sülldorfer Feldmark

The width of the Wedeler Au fluctuates between 0.5 m at the upper and 3 m at the lower reaches, where it also reaches its greatest depth with a good 1 m; only at the former Auhafen has it been artificially significantly widened. With an average gradient of 0.02 ‰, it has only a low flow energy . Its catchment area covers 55.85 km², of which 21.64 km² (corresponding to 39%) are in Hamburg and 34.21 km² in Schleswig-Holstein; Its catchment area borders on that of the Düpenau to the east and north, and on that of the Elbe to the south and west.

The Wedeler Au rises at around 21  m above sea level. NN in the Sülldorfer Feldmark , a Geest area , and initially flows in a north-north-west direction along the city limits between Hamburg and Schenefeld, and after a few meters it is piped to a retention basin , which it serves as a receiving water when it overflows due to heavy rain . Then it passes the " West sewage treatment plant " on the street Ellernholt, which was closed in 1981, and describes an only slightly meandering semi-arch in a west-southwest direction , again openly and mainly flowing through green and arable land with old rows of trees and bent structures . After about 3.5 km - east of the Klövensteenweg, where there is another retention basin - it leaves the agricultural area and separates the Klövensteen forest from the adjacent single and terraced houses in the Rissen district to the south . After a short, sharp turn to the south (west of Gernotstrasse), it flows again in a west-south-west direction at the level of the Hanna Reemtsma Foundation, leaving the Hamburg state territory after 6 km on the Schulauer Moorweg.

Tidal lower course with the theater ship Batavia; behind the rear lies the Auhafenbecken, right behind the reeds, the new Fluttor

From then on, the Wedeler Au runs largely parallel to the S-Bahn line Altona – Wedel (S1) through meadows until it widens north of Wedeler train station and city center to the mill pond, which is dammed up by a weir first mentioned in 1314 . Behind the weir she enters the Wedeler Marsch , where the former Auhafen lies at the crossing under Schulauer Strasse; The theater ship Batavia has been lying in this since the early 1970s . There is also a small pleasure boat harbor there , but the city prohibited its further use at the end of the 2000s. The last 2.1 kilometers flows reedy, from here tidal river Au initially before the old dike (dam Brooks) in a southwesterly direction through the marshland . Since the expansion of the Hamburg marina on the Elbe, it has been led to the northwest just before its historic confluence, where it again bends sharply south at the confluence with the Hetlinger Inner Elbe and drains into the Lower Elbe through a flood-proof barrage in the new dike line .

There is no continuous path along the bank of the stream. The source and large sections of the upper course can be seen, if at all, at best from a distance or from one of the dirt road bridges. A field and bridle path runs parallel to the bank for a few hundred meters from the confluence of the Laufgraben to Klövensteenweg, but only rarely with a view of the water, then another footpath at the southern pivot west of the Rissener Gernotstraße. Accessibility is better from Klövensteen because the right bank is less steep there; on the left it is up to 4 m high. In the Wedeler area in the Autal valley to the Mühlenteich there is a long, well-developed cycle and hiking path ("Auweidenweg") right next to the railway embankment, which provides a good view of the wide valley but is relatively far away from the stream. The same applies to the path on the northern edge of the valley. Only again to the west of Schulauer Straße and again only in sections there is again the possibility of walking or cycling along the Wedeler Au over the last two kilometers to the mouth.

Tributaries and crossings

Confluence of the trench

Most of the tributaries are short , anthropogenic rivers formed into ditches . Still in the Feldmark, the Wedeler Au flows into the Iserbrook, Ellernholt, Schlankweg and Panzergraben on the left. Down the stream follow the right-hand tributaries Lauf- (with Seggen-) and Rissener Moorgraben as well as the Rüdigerau , which is also mainly fed by drainage ditches (Sandbargsmoor- or Schnaakenmoorgraben). The Schulauer Moorgraben (with Steenbarg- and Rissener Dorfgraben) flow near the city limits, again on the left bank, and shortly before their own confluence on the right-hand side the Hetlinger Binnenelbe into the Wedeler Au.

Several bridges cross the stream, including six road bridges , some of which are heavily used (Ellernholt, Klövensteen- and Sandmoorweg in Hamburg, Autal, Mühlen-, Schulauer and Austraße in Wedel). There are also numerous smaller bridges for pedestrians and agricultural vehicles, five alone on the first four kilometers of the stream (dirt roads 65, 67, 68, 82 and 81). The oldest crossing the arched belonged floor bridge in Wedel, which demolished but in the early 1980s in the wake of improvements at Schulauer road and a new bridge, into which a floodgate was replaced is embedded.

Water condition

Physico-chemical state

Retention basin close to the spring,
the Wedeler Au on the left

Since the 1950s, numerous straightening and fortification measures ( trapezoidal cross-section, bank reinforcement with bongossi wood ) with significant hydrological consequences have been carried out on the upper and middle reaches, especially in the intensively agricultural area in the Hamburg area, as well as on the tributaries . This generally led to an increase in the flow speed, which was only marginally restricted by the opposing effect of the bridge structures - it rather regularly reached peak values, especially after heavy rainfall, which resulted in a "clearing effect" for aquatic organisms. In addition, when the precipitation was superimposed with mixed water overflow from the Hamburg sewer network at the retention basin close to the spring, considerable nutrient and pollutant loads were temporarily carried in, which negatively influenced the chemical condition of the water. The basin (capacity: 17,600 m³) has a fine screen for mechanical clarification of the draining water, but from this source alone, an average of 15,000 m³ is fed into the stream over many years, which corresponds to a COD of 1.5 t for this amount of water per year . Furthermore, there are three rainwater outlets in cracks (discharge points for rainwater from busy streets and from commercial areas with sewage separation) for approx. 300 hectares of connected paved area. On average, around 250,000 m³ of rainwater is discharged into the water every year; this corresponds to a load of approx. 11 tons of organic carbon (TOC) per year.

Larger iron ocher deposits occur in the soil of the adjacent fields and pastures , which, if washed out, also significantly impair the colonization of the body of water for animals and plants. Stream bed, sediments and water substrate are largely organic to sand, whereas gravel or stony sections with their higher cleaning effect are rare; the transport of suspended matter in the Wedeler Au clouds the water. Its acid-binding capacity is around 2  mmol / l, the pH value between 6.7 and 7.6; No information is available on chlorides . According to the water quality report from 1999, the load on the oxygen balance through degradable organic substances ( saprobia ) was in the medium range. An examination of the water sediments for heavy metals in 1993 showed that the upper reaches of lead (31–60 mg per kg of dry matter ) and cadmium (0.46–0.90 mg / kg DM) were relatively low, but four times along the middle course near the state border as high (lead 120-240, cadmium 1.81-3.60 mg / kg DM).

In addition to agriculture, the increasingly intensive use of leisure time, especially in Klövensteen, and the development (residential, commercial, traffic routes), especially in Rissen and Wedel, have resulted in the loss of natural bank margins and the restriction of the ecological development potential of the Wedeler Au contributed. Taken together, this meant that the water quality of the Wedeler Au was still rated as II-III (“critically polluted”) in 2001, only in sections as III (“heavily polluted”).

Biological condition

flora

Autochthonous plankton can hardly develop in the small flowing water. No surveys have been carried out to date on the occurrence of phytobenthos . In general, the aquatic flora here “is not very pronounced compared to other lowland streams in the Geest; especially plants that flood in the water are largely absent ”, which could be caused by the iron ocher precipitations. During an inspection in 2003 only individual floating ( duckweed , pond roses ) and rooting ( pondweed , water stars ) aquatic plants were found; a systematic survey does not yet exist.

Bank vegetation at the level of dirt road 65

In the Hamburg area, near-natural riparian strips are only partially available and often only narrow as a result of the stream regulation measures and the human uses that extend to the banks. However, they have been restored or widened in the course of renaturation since the late 1980s (see below ); In 2003 mainly types of cornices and sedges as well as hedgehog cob were found. In the Wedel section between the state border and the mill pond, these measures were completed in 1994; belts of reeds have now formed there again.

However, the plant cover (meadows and pastures, coniferous, deciduous, mixed and broken forest, bog, marshland and dunes) that are partly directly adjacent to the stream offer a much greater botanical variety.

fauna

Nine-spined stickleback

Detailed test results are available for the Hamburg part of the brook. According to the species register collected between 1982 and 1986, the fish biocenosis showed a noticeably low density of individuals and species poverty; Long-lived species were also underrepresented - an indicator of the poor condition of the Wedeler Au. The occurrence was mainly reduced to eels and two species of stickleback ( three- and nine-spined stickleback ); Sticklebacks are often the only ones able to colonize small bodies of water in the cultural landscape. American dogfish ( Umbra pygmaea ) and Moderlieschen , even more rarely brown trout , crucian carp , roach , gudgeon , tench and ruffle were found only in isolated cases . Meanwhile, smelts , flounders and sea ​​trout are occasionally found in the mouth of the Elbe , there and further upriver perch , pikeperch and eels as predatory fish species and from the non-coarse carp as well as the bream and alandes, which are very common in the area of ​​influence of the Elbe .

The macrozoobenthos was examined on the upper and middle reaches in 2000/01. It outweighed annelids (Oligochaeta) and small crustaceans ( amphipods , isopods ). Among the insects, caddis flies , two-winged fly and mosquito larvae in particular are strongly represented. Other insects also appeared near the source, such as B. Bedbugs, mudflies and beetles. The river flea shrimp is the most populous species in the entire Hamburg area.

Common snipe

A number of bird species that were still native to the Wedeler Au in the middle of the 20th century no longer occur, for example black grouse , curlew and goat milker , which is lacking in butterflies, beetles and other flying insects due to agricultural intensification and fertilization . However, due to the variety of adjacent vegetation types, the area still offers a habitat for numerous birds. Two areas stand out: the open wet meadows on the upper and middle reaches, where rare and particularly protected species such as lapwing , kingfisher , marsh warbler , common snipe and whinchat breed and nest, and the marsh near the estuary and the North Sea with around 160 species of birds.

Renaturation and protected areas

From the mid-1980s, there was a careful change of direction in dealing with the Wedeler Au. In addition to a changing environmental awareness, the fact that the field of activity of the few farmers resident in the Sülldorf-Rissener Feldmark has shifted away from intensive cultivation and towards services “all about riding horses”; one of the remaining farmers now practices organic farming. In local politics, too, the understanding of changing demands on the recreational value of near-natural landscapes in the big city grew. In the 1990s, this increasingly found its way into urban and regional planning practice; in Hamburg, for example, not only a landscape, but also a species protection program was developed from 1995 onwards when the new urban development concept was drawn up. However, other usage interests (in this area mainly additional horse stables, attractive residential areas and road expansion) continue to compete with the renaturation. In particular, the structural expansion of the farms in the Feldmark is often difficult to prevent in practice due to the “agricultural privilege” according to the BauGB . In the summer of 2010, the local farmers complained about increasing waterlogging of their land.

Renatured flood basin on the middle course (right back),
left the Wedeler Au

The city of Wedel took the first measures: from 1984 the mill pond was desludged and the stream above it was drained. In Hamburg, private nature conservation organizations ( NABU , GÖP ) took on “Bach sponsorships” and, with the support of the district assembly and the Altona district office , worked off deficits in small steps. Some renatured sections of the stream meander again and have been provided with a near-natural, gravel-covered bottom as well as woody plantings on the flattened bank; two ponds with extensive swamp and shallow water zones were created and connected to the Wedeler Au. In addition, the retention basin on the middle course was dismantled into a flood basin . In the summer of 2006 bullet mussels , gudgeon , brook loach , berle and watercress could be found again on the Au .

In 2007, the Wedeler Au itself and large areas, especially to the north, are under protection. However, this is neither a coherent protection nor uniform instruments for enforcing these protection ordinances. Rather compartments as conservation area (LSG) nature reserve (NSG) or into national law on guided EU directives identified, and responsibilities are spread equally to different organs of the executive branch .
In detail these are:

• in Hamburg
  • the stream section in the Altona district and its bank areas as "European fish waters" according to the EU Water Framework Directive , as floodplain development area according to the landscape program and, apart from a short distance east of the state border, as part of the Baursberg water protection area
  • Parts of the Rissen-Sülldorfer Feldmark and the forest Klövensteen as LSG
  • The Schnaakenmoor as NSG, which also as a reserve for the Fauna Flora Habitats Directive was notified
• in fronds
  

  Muzzle into the Lower Elbe
  • the entire section of the brook located in Wedel as part of the Natura 2000 area "Schleswig-Holstein Elbe estuary and adjacent areas"
  • the creek section above the mill weir as part of the LSG "Holmer Sand Mountains and Moor areas"
  • the stream section below the mill weir as part of the LSG "Wedeler Marsch"
  • the mouth of the Wedeler Au with its rest of the Auwald forest located outside the dike as part of the NSG "Haseldorfer Inner Elbe with Elbe Foreland"

In addition, the entire stream and its extensive surroundings are designated as “endangered” within the framework of the EC nitrate directive and as “sensitive area” within the framework of the municipal waste water directive .

Creation of a regional park

The project of a transnational regional park "Wedeler Au / Rissen-Sülldorfer Feldmark" has existed since the beginning of the 21st century , which in the north extends well beyond the catchment area of ​​the brook, but leaves out urban settlement centers. Of its planned 51.3 km² area, 36% are in Hamburg, 27% in Wedel, 13% in Holm , 11% in Pinneberg , 7% in Appen and 6% in Schenefeld . As the first project of this kind in the Hamburg metropolitan region , it has a model character for the cooperation between the federal states of Schleswig-Holstein, Hamburg and Lower Saxony, which is not involved in this. It was recognized as a model project in 2003; In autumn 2005 the contract for an ongoing appraisal procedure was awarded to the Hamburg landscape architects Schaper, Steffen and Runtsch, a project-accompanying working group made up of representatives of the municipalities involved was set up under the leadership of the Wedel city administration and the first version of the appraisal was presented to them in May 2007. The report contained an inventory assessment, presented conflicts of use, deficits and development potential and contained a target and framework concept as well as a detailed catalog of proposals for concrete measures. The schedule provided for some of the individual projects to be implemented between 2008 and 2013 and to present them as a regional contribution to the 2013 International Garden Show in Hamburg-Wilhelmsburg .

Old, difficult to access sewer on the edge of the Klövensteen

In summary, the focus of the concept was on "safeguarding landscape sensitive zones" and their "development ... to increase the local recreational attractiveness", which should be created by a network of paths with viewpoints and supplemented by "focus areas for intensive recreation". “The Wedeler Au, which gives it its name, is to be developed as a leading body of water”, with the preservation of the extensively used grassland areas and the “near-natural water structures” being of central importance.
Of the 20 proposed individual projects in sub-areas, four related directly to the Wedeler Au and its immediate vicinity: On the upper and middle reaches, among other things, the "extensification and partial rewetting of lowland grassland as a measure to protect meadow birds" was proposed; in addition, the source was to be relocated to a new, small swamp area north of the street Ellernholt. In the valley area from the Wedel area to the Mühlenteich, the expansion of the local recreational function “taking into account the requirements as a protected area of ​​European importance” - meaning the Natura 2000 area - is being pursued, in the inner city “accessibility and experience” are to be improved. Finally, in the estuary area, the "development of landscape-related, extensive local recreation" is also to be promoted. As a first measure, the city of Wedel has started to close the gap in the Elbe river bank cycle and hiking trail in the area of ​​the power plant - i.e. not near the stream - for which the council has already approved funds totaling around € 80,000. In 2013, an investigation began as to the extent to which the inland dunes , which have been overgrown by the forest since the reforestation , can be exposed again to the extent that they can serve as "stepping stones" for a large-scale dry biotope axis and the living conditions of plants and animals typical of the region - for example silver grass , heather , mountain sand bells , Sand lizard and smooth snake  - can help improve.

How the project can actually be implemented in the next decade is still partly questionable. For one thing, a large part of the space required is privately owned; on the other hand, the contradiction between the intended improvement of the traffic accessibility or the intensification of the use of local recreation and the concept of maintaining and expanding the near-natural areas has yet to be resolved, also in the opinion of the experts. The concept was to be presented to the public for the first time in spring 2008, but this has not yet happened in 2010, although this was intended. Instead, a new association (Regionalpark Wedeler Au e.V.) was officially founded in November 2009 - after about one and a half years of discussion of the statutes in the participating municipalities and the Pinneberg district - as the sponsor of the regional park.

Two projects were implemented in the 2010s. On the one hand, several GPS- supported “digital information paths” now lead through the park. On the other hand, a "water experience zone " has been created on a remediated , former suspected contaminated site in the Wedel area. Individual entrances to the stream were created there. Information boards about the plants and animals to be observed were set up for both projects. At the beginning of 2020, two sand traps will be created above the mill pond in order to reduce the heavy sedimentation in the pond itself. In addition, a requirement of the EU Water Framework Directive from 2000 is also implemented by installing gravel and dead wood in the stream bed.

literature

Printed sources

• Office for Environmental Protection (Free and Hanseatic City of Hamburg): Implementation of the EU Water Framework Directive (WFD). State-internal report on the processing area Wedeler Au. Inventory and initial assessment. (As of September 20, 2004)
• Bürgererverein Sülldorf-Iserbrook (ed.): Sülldorfer history and stories. Self-published, Hamburg undated, 2006
• Josef Nyary: The natural wonders of the Wedeler Au. Hamburger Abendblatt from August 25, 2006
• Schaper / Steffen / Runtsch garden and landscape architects (on behalf of the urban and landscape planning department of the City of Wedel in cooperation with the urban and landscape planning department of the Hamburg-Altona district office): Wedeler Au / Rissen-Sülldorfer Feldmark regional park . Framework concept short version. (Status: April 16, 2007; the long version was not yet completed at the end of August 2007)
• Environmental authority (Free and Hanseatic City of Hamburg): Environmental Atlas Hamburg 1994. (Reprint 1994)

Web links

Commons : Wedeler Au  - collection of images, videos and audio files

• Official website of the Wedeler Au Regional Park
• Page about the Bach sponsorship of NABU

Individual evidence

1. ^ Office for Environmental Protection, p. 8
2. ↑ ^{a b c d e f} http://www.regionalpark-wedeler-au.de/index.php?id=14
3. ↑ Archive link ( Memento from September 27, 2007 in the Internet Archive )
4. ↑ Reproduction of the map in Markus Krohn (Ed.): Jubilee book 750 years Sülldorf. MK Medien und Marketing, Hamburg 2006, pp. 12/13.
5. ↑ Article ( Memento of February 24, 2015 in the Internet Archive ) on the history of the grain mill on the website of the Wedel City Archives. Retrieved February 24, 2015.
6. ↑ Johannes Heidorn in Bürgererverein, pp. 14, 18 and 25.
7. ^ Authority for Environment and Health (Free and Hanseatic City of Hamburg): Nature in the City. The Hamburg nature reserves. Hamburg o. J. (2003), p. 56.
8. ↑ see http://www.batavia-wedel.de/batavia (with photos of the surroundings).
9. ↑ For the legal dispute about the area previously used by the Motorboot Club Schulau , see, for example, this article from September 9, 2009 from the Hamburger Abendblatt.
10. ↑ Detailed map of the water system at http://www.regionalpark-wedeler-au.de/index.php?id=82
11. ^ Office for Environmental Protection, pp. 25 and 30.
12. ^ Office for Environmental Protection, pp. 19 and 21.
13. ^ Office for Environmental Protection, pp. 11 and 23.
14. ↑ Office for Environmental Protection, p. 30.
15. ↑ Environmental Authority, pp. 116–118.
16. ^ Office for Environmental Protection, pp. 13/14.
17. ^ Office for Environmental Protection, pp. 23-30.
18. ^ Office for Environmental Protection, p. 29.
19. ↑ Office for Environmental Protection, p. 27 ff.
20. ↑ in the investigation apparently only listed as "Hundsfisch ( Umbra sp. )"; for the species see Leonhard Diercking, Lorenz Wehrmann: Species protection program fish and round mouths in Hamburg. Nature conservation and landscape management in Hamburg (series of publications by the environmental authority) No. 38, 1991, p. 114.
21. ↑ Archive link ( Memento from November 4, 2012 in the Internet Archive )
22. ↑ Archive link ( Memento from March 10, 2016 in the Internet Archive )
23. ^ Wilhelm Schröder in Bürgererverein, p. 33 f.
24. ↑ ^{a b} Josef Nyary: The natural wonders of the Wedeler Au. Hamburger Abendblatt from August 25, 2006.
25. ↑ At http://www.regionalpark-wedeler-au.de/index.php?id=17 there is a map with riding stables, riding arenas and riding paths.
26. ^ Urban development authority (Free and Hanseatic City of Hamburg): Urban development concept. Mission statement, orientation framework and spatial focus. (As of December 1996), pp. 68-73.
27. ^ Office for Environmental Protection, p. 25.
28. ↑ see also the aerial photo of the Hamburg NSG and LSG under archive link ( Memento from September 30, 2007 in the Internet Archive )
29. ^ Map of the landscape program of the Free and Hanseatic City of Hamburg from July 1997 (including updates up to November 2006), ed. by the Department for Urban Development and the Environment, April 2007.
30. ↑ Ordinance of October 31, 2006; see also Nature Conservation Office (Free and Hanseatic City of Hamburg): Nature in the City. The Hamburg nature reserves. Hamburg 2002, p. 56/57, as well as the quote about the protective purpose according to § 2, (1) of the regulation in the nature reserve Schnaakenmoor .
31. ^ Office for Environmental Protection, p. 54.
32. ^ Map at http://www.regionalpark-wedeler-au.de/index.php?id=11
33. ↑ Schaper / Steffen / Runtsch, p. 4.
34. ↑ All of the following quotations from Schaper / Steffen / Runtsch, pp. 11–13, unless otherwise stated.
35. ↑ Detailed suggestions for the entire course of the stream at http://www.regionalpark-wedeler-au.de/index.php?id=91
36. ↑ Detailed draft for the source area in Schaper / Steffen / Runtsch, p. 16, and on http://www.regionalpark-wedeler-au.de/index.php?id=77
37. ↑ after notification by telephone from a working group member from the Wedel town hall to the main author of this article (for the main author see here ).
38. ↑ Wedel-Schulauer Tageblatt of July 23, 2013, p. 4
39. ↑ http://www.regionalpark-wedeler-au.de/index.php?id=31
40. ^ Message from the district nature conservation officer at the meeting of the Altona planning committee on July 15, 2009.
41. ↑ Oliver Gabriel: Eco-offensive with shovel excavators. , Wedel-Schulauer Tageblatt of January 23, 2020, p. 3

This article was added to the list of excellent articles on September 7, 2007 in this version .